US7760037B2 - Process, voltage, and temperature compensated clock generator - Google Patents
Process, voltage, and temperature compensated clock generator Download PDFInfo
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- US7760037B2 US7760037B2 US11/692,325 US69232507A US7760037B2 US 7760037 B2 US7760037 B2 US 7760037B2 US 69232507 A US69232507 A US 69232507A US 7760037 B2 US7760037 B2 US 7760037B2
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- voltage
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- clock generator
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/01—Details
- H03K3/011—Modifications of generator to compensate for variations in physical values, e.g. voltage, temperature
Definitions
- On-die clock generators may have large variations across different process, voltage, and temperature corners.
- a trim by die method is used, which can be complex and time consuming during testing.
- FIG. 1 is an illustration of a charge-charge clock generator according to some embodiments.
- FIG. 2 is an illustration of a process and voltage compensated current source according to some embodiments.
- FIG. 3 is an illustration of a proportional to absolute temperature (PTAT) current source according to some embodiments.
- FIG. 4 is a block diagram of a system according to some embodiments.
- references to “one embodiment”, “an embodiment”, “example embodiment”, “various embodiments”, etc., indicate that the embodiments) of the invention so described may include particular features, structures, or characteristics, but not every embodiment necessarily includes the particular features, structures, or characteristics. Further, some embodiments may have some, all, or none of the features described for other embodiments.
- Coupled is used to indicate that two or more elements are in direct physical or electrical contact with each other.
- Connected is used to indicate that two or more elements are in direct physical or electrical contact with each other.
- Connected is used to indicate that two or more elements are in direct physical or electrical contact with each other.
- Connected is used to indicate that two or more elements are in direct physical or electrical contact with each other.
- Coupled is used to indicate that two or more elements co-operate or interact with each other, but they may or may not be in direct physical or electrical contact.
- wireless and its derivatives may be used to describe circuits, devices, systems, methods, techniques, communications channels, etc., that communicate data by using modulated electromagnetic radiation through a non-solid medium. The term does not imply that the associated devices do not contain any wires, although in some embodiments they might not.
- mobile wireless device is used to describe a wireless device that may be in motion while it is communicating.
- a low power on-chip clock generator to compensate for process, voltage, and temperature (PVT) variation is disclosed.
- the PVT compensated clock generator generates a stable clock for a synchronous digital circuit.
- FIG. 1 is an illustration of a charge-charge clock generator 100 according to some embodiments.
- the clock generator 100 uses a process, voltage, and temperature compensated current source, I PVT , 102 , to charge the load capacitive elements, C load 104 , 106 .
- Each capacitive load element 104 , 106 is coupled to a comparator 112 .
- the load capacitive elements may be capacitors.
- the comparator 112 compares the charging voltages, V c1 108 and V c2 110 , to a reference voltage, V ref 111 .
- the reference voltage 111 may be a process, voltage, and temperature independent reference voltage.
- the output of the comparator 112 is coupled to a D-flip flop 114 .
- the D-flip flop 114 As the current source 102 charges and discharges the capacitive loads 104 , 106 , the D-flip flop 114 is switched to generate a stable process, voltage, and temperature independent clock 120 .
- the clock period may be described by the following equation:
- FIG. 2 is illustration of the process, voltage, and temperature compensated current source, I PVT , 102 of FIG. 1 .
- the current source 102 includes a proportional to absolute temperature (PTAT) circuit 202 coupled to current mirror circuitry 204 that has a low sensitivity to process and voltage supply variation.
- PTAT proportional to absolute temperature
- transistor M 1 has a W/L (channel width/channel length) ratio that is ‘A’ times larger than that of M 2 .
- the values for W and L may be chosen as long and wide channel to minimize the process variation.
- Vg 1 and Vg 2 are the gate voltages of M 1 and M 2 , respectively.
- M 4 , M 5 , and M 6 are current mirrors. Negative feedback through M 3 stabilizes the circuit.
- the currents I 1 and I 2 may be expressed by the following equations, where U is mobility:
- I 1 1 2 ⁇ A ( W L ) ⁇ U ⁇ ⁇ C ox ⁇ ( V g ⁇ ⁇ 1 - V t ) 2
- I 2 1 2 ⁇ ( W L ) ⁇ U ⁇ ⁇ C ox ⁇ ( V g ⁇ ⁇ 2 - V t ) 2
- I out 206 is equal to the following, where V r1 is the voltage across resistor R 1 :
- I out 206 is independent of process and voltage supply. Only the mobility, U, and voltage, V r1 , vary with temperature. The temperature variation of V r1 can be controlled through circuit design. Since mobility has a negative temperature coefficient, use of a PTAT reference voltage, V r1 , can compensate for any variation in mobility, U, due to temperature.
- FIG. 3 illustrates the PTAT circuit 202 of FIG. 2 , according to some embodiments.
- a 1 and A 2 are bipolar transistors.
- the size of A 1 may be larger than the size of A 2 .
- the current, I is:
- I is the current I r1 of FIG. 2 , thus:
- V r1 will be proportional to temperature and insensitive to any process and/or voltage variation.
- the current source, I PVT , 102 may be described by the equation:
- I out 1 2 ⁇ A ( W L ) ⁇ U ⁇ ⁇ C ox ( 1 ( A - 1 ) ⁇ R 1 R 2 ⁇ kT q ⁇ ln ( A 1 A 2 ) ) 2
- A is the device size ratio between a transistor pair in the current source ( FIG. 2 )
- W and L are the channel width and length for the transistors ( FIG. 2 )
- U is mobility
- R 1 and R 2 are the values of the resistive elements in the current source ( FIG. 2 , FIG. 3 )
- a 1 and A 2 are the areas of the bipolar transistors used in the PTAT circuit ( FIG. 3 ).
- the clock period may be independent of process, voltage, and temperature by careful selection of design parameters as given in the above formula.
- the charge-charge clock generator 100 provides a stable clock 120 .
- the clock period does not vary with process, voltage, and/or temperature.
- the clock may be more reliable at higher clock frequencies.
- FIG. 4 is a block diagram of a system according to some embodiments.
- the system may be a mobile wireless device.
- the system may include a controller 402 which communicates via an interconnect 406 .
- the controller 402 may be a microcontroller, one or more microprocessors, each of which may include one or more cores, a digital signal processor (DSP), or another type of controller.
- DSP digital signal processor
- the system may be powered by a battery 404 or may be powered with another power source, such as AC power.
- I/O devices 416 may be coupled to the interconnect 406 .
- the I/O devices may include items such as a display, keyboard, mouse, touch screen, or other I/O devices.
- a wireless network interface 408 including an antenna 410 may also be coupled to the interconnect 406 .
- the wireless interface 408 may enable cellular or other wireless communication between the system and other devices.
- the antenna 410 may be a dipole antenna.
- the system also includes a non-volatile memory device 420 , such as, but not limited to, a NOR type flash memory device.
- the memory device may be built into the system, or may be part of a removable storage medium, such as a card form factor, that may be inserted into an optional card interface 412 or other type of interface.
- the memory device 420 may include a process, voltage, and temperature compensated clock generator 100 , such as, for example, the clock generator circuit illustrated and described above with respect to FIGS. 1-3 .
- the memory device may also include other well known elements not illustrated here for the sake of clarity, such as, for example, a memory array, control logic, and other elements.
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US11/692,325 US7760037B2 (en) | 2007-03-28 | 2007-03-28 | Process, voltage, and temperature compensated clock generator |
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US11/692,325 US7760037B2 (en) | 2007-03-28 | 2007-03-28 | Process, voltage, and temperature compensated clock generator |
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US20080238518A1 US20080238518A1 (en) | 2008-10-02 |
US7760037B2 true US7760037B2 (en) | 2010-07-20 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130120051A1 (en) * | 2010-07-27 | 2013-05-16 | Taiwan Semiconductor Manufacturing Company, Ltd. | Circuit and method for generating clock signal |
US10027312B2 (en) | 2016-09-08 | 2018-07-17 | Nxp Usa, Inc. | Low temperature coefficient clock signal generator |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2927595C (en) * | 2004-12-22 | 2023-01-31 | Ambrx, Inc. | Compositions containing, methods involving, and uses of non-natural amino acids and polypeptides |
US7816967B1 (en) | 2009-06-19 | 2010-10-19 | Maxim Integrated Products, Inc. | System and method for compensating pulse generator for process and temperature variations |
TWI405068B (en) * | 2010-04-08 | 2013-08-11 | Princeton Technology Corp | Voltage and current generator with an approximately zero temperature coefficient |
TWI520495B (en) | 2013-06-06 | 2016-02-01 | 財團法人工業技術研究院 | Crystal-less clock generator and operation method thereof |
GB2533390A (en) * | 2014-12-19 | 2016-06-22 | Nordic Semiconductor Asa | Relaxation oscillator |
US9831858B2 (en) * | 2016-01-15 | 2017-11-28 | Semiconductor Components Industries, Llc | Ring oscillator with opposed voltage ramps and latch state |
Citations (4)
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US5497127A (en) * | 1994-12-14 | 1996-03-05 | David Sarnoff Research Center, Inc. | Wide frequency range CMOS relaxation oscillator with variable hysteresis |
US6052035A (en) * | 1998-03-19 | 2000-04-18 | Microchip Technology Incorporated | Oscillator with clock output inhibition control |
US6348842B1 (en) * | 2000-10-25 | 2002-02-19 | Winbond Electronics Corporation | Method and apparatus for achieving accurate temperature-invariant sampling frequencies in a multiple message non-volatile multilevel analog signal recording and playback system |
US20060226922A1 (en) * | 2005-04-07 | 2006-10-12 | Rajagopal Narasimhan T | Process, supply, and temperature insensitive integrated time reference circuit |
-
2007
- 2007-03-28 US US11/692,325 patent/US7760037B2/en active Active
Patent Citations (4)
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US5497127A (en) * | 1994-12-14 | 1996-03-05 | David Sarnoff Research Center, Inc. | Wide frequency range CMOS relaxation oscillator with variable hysteresis |
US6052035A (en) * | 1998-03-19 | 2000-04-18 | Microchip Technology Incorporated | Oscillator with clock output inhibition control |
US6348842B1 (en) * | 2000-10-25 | 2002-02-19 | Winbond Electronics Corporation | Method and apparatus for achieving accurate temperature-invariant sampling frequencies in a multiple message non-volatile multilevel analog signal recording and playback system |
US20060226922A1 (en) * | 2005-04-07 | 2006-10-12 | Rajagopal Narasimhan T | Process, supply, and temperature insensitive integrated time reference circuit |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130120051A1 (en) * | 2010-07-27 | 2013-05-16 | Taiwan Semiconductor Manufacturing Company, Ltd. | Circuit and method for generating clock signal |
US8705308B2 (en) * | 2010-07-27 | 2014-04-22 | Taiwan Semiconductor Manufacturing Company, Ltd. | Circuit and method for generating clock signal |
US10027312B2 (en) | 2016-09-08 | 2018-07-17 | Nxp Usa, Inc. | Low temperature coefficient clock signal generator |
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US20080238518A1 (en) | 2008-10-02 |
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